What is preventive maintenance in aviation, and what is a typical example?

What is preventive maintenance in aviation, and what is a typical example?

• A. Unscheduled repairs after a component fails.
• B. Cosmetic cleaning of aircraft surfaces.
• C. Scheduled maintenance performed to prevent failures; for example, replacing hydraulic fluid filters at prescribed intervals.
• D. Engine overhauls after a fixed number of flight hours.

Answer: (C)

Preventive maintenance is maintenance done on a planned, scheduled basis to keep systems functioning and to prevent failures before they happen. It relies on time, usage, and reliability data rather than waiting for a problem to appear. A typical example is replacing hydraulic fluid filters at prescribed intervals. Filters remove contaminants that could cause wear or failure in the hydraulic system, so changing them on a schedule reduces risk, maintains reliability, and helps meet airworthiness requirements. Unscheduled repairs happen after a failure, which is reactive. Cosmetic cleaning doesn’t address safety-critical systems. Engine overhauls after a fixed number of flight hours are scheduled maintenance too, but the example of replacing filters is a classic, everyday preventive task that illustrates the concept.

Preventive maintenance is maintenance done on a planned, scheduled basis to keep systems functioning and to prevent failures before they happen. It relies on time, usage, and reliability data rather than waiting for a problem to appear. A typical example is replacing hydraulic fluid filters at prescribed intervals. Filters remove contaminants that could cause wear or failure in the hydraulic system, so changing them on a schedule reduces risk, maintains reliability, and helps meet airworthiness requirements.

Unscheduled repairs happen after a failure, which is reactive. Cosmetic cleaning doesn’t address safety-critical systems. Engine overhauls after a fixed number of flight hours are scheduled maintenance too, but the example of replacing filters is a classic, everyday preventive task that illustrates the concept.